Abstract: Stable hydrogen and oxygen isotope is important on water transportation tracing research. Based on stable hydrogen and oxygen isotope using a Picarro L1102-i(V-SMOW standard)and water chemistry(e.g., major ions, pH and EC, TDS)measurement with Dionex-600 and Dionex-300, this paper discussed the variation and characteristics of stable hydrogen and oxygen isotope, chemistry(TDS, pH, EC, Ca²⁺, Mg²⁺, Na⁺, and Cl^-) in the glacier meltwater, ice and snow, and precipitation in the Laohugou glacier basin during 2012-2013. Result showed that δD and δ¹⁸O in the glacier melt runoff varied obviously with the temporal change from June to September, firstly with increase trend and then with decrease trend, and highest value in July with the highest air temperature and strong glacier melting, indicating the glacier melting process and extent. δD and δ¹⁸O in the runoff is similar with that of snow and ice on the glacier, and is also above the LMWL, which is probably imply the hydrogen and oxygen isotope is mainly originated from glacier melting and precipitation supply. The glacier meltwater type of Laohugou glacier basin are mainly composed by Ca-Na-HCO₃-SO₄ and Ca-Mg-HCO₃-SO₄, which also varied with the glacier melting process in summer. By analyzing the temporal change of stable hydrogen and oxygen isotope and chemistry in melting period, it is easy to separate the components of the snow and ice and melt-runoff in the river, which could reflect the change of glacier melting process during the melting period, and thus this work can contribute to the glacier runoff change study of large scale region by stable isotope and geochemical method in future.

Key words: glacier meltwater, Stable hydrogen and oxygen isotope, chemistry, runoff process, Laohugou